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Complete oxidation of 1,4-dioxane over zeolite-13X-supported Fe catalysts in the presence of air

Chinese Journal of Catalysis 2016年第2期37卷 240-249页

作者： C.Ramakrishna R.Krishna T.Gopi G.Swetha Bijendra Saini S.Chandra Shekar Anchal Srivastava 国防研发局、防化装备评估设备(CDEF) 印度那格浦尔MH-441108

Zeolite-13X-supported Fe（Fe/zeolite-13X） catalysts with various Fe contents were prepared by the wet impregnation *** catalysts were characterized by N2 adsorption-desorption isotherms to estimate the Brunauer-Emmett-Teller surface areas and Barrett-Joyner-Hanlenda pore size distributions.X-ray diffraction,scanning electron microscopy,temperature-programmed reduction,and temperature-programmed desorption of NH3 were used to investigate the textural properties of the Fe/zeolite-13 X *** catalytic activities were determined for the complete oxidation of1,4-dioxane using air as the oxidant in a fixed-bed flow reactor in the temperature range 100-400℃.The influences of various process parameters,such as reaction temperature,metal loading,and gas hourly space velocity（GHSV）,on the dioxane removal efficiency by catalytic oxidation were *** stability of the catalyst was tested at 400℃ by performing time-on-stream analysis for 50 *** Fe/zeolite-13 X catalyst with 6 wt%Fe exhibited the best catalytic activity among the Fe/zeolite-13 X catalysts at 400℃ and a GHSV of 24000 h^（-1）,with 97%dioxane conversion and95%selectivity for the formation of carbon oxides（CO and CO2）.Trace amounts（ 3%） of acetaldehyde,ethylene glycol monoformate,ethylene glycol diformate,1,4-dioxane-2-ol,1,4-dioxane-2-one,and 2-methoxy-1,3-dioxalane were also formed as degradation products.A plausible degradation mechanism is proposed based on the products identified by GC-MS analysis.

关键词： Iron Zeolite-13X 1 4-dioxane Catalytic degradation Complete oxidation Degradation mechanism

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Current status and prospects of research on 1,4-dioxane pollution and treatment technologies in the water environment

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Journal of Groundwater Science and Engineering 2023年第2期11卷 158-170页

作者： Chun-xiao Wang Yong Qian Zhao-ji Zhang Chen Yue Chun-yan Guo Xiang-xiang Cui Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological SciencesShijiazhuang 050061China Key Laboratory of Groundwater Contamination and Remediation China Geological Survey(CGS)&Hebei ProvinceShijiazhuang 050061China

1,4-dioxane pollution is characterized by its early identification, widespread sources and extensive distribution. The pollutant is highly mobile and persistent in the water environment and is classified as a B2(probable) human carcinogen. After reviewing recent researches on the pollution status,transport and transformation characteristics of 1,4-dioxane in the water environment, as well as the environmental pollution remediation and treatment technologies, and the status of environmental regulation,this paper addresses that the distribution of 1,4-dioxane in water bodies is significantly correlated with chlorinated hydrocarbon pollutants such as 1,1,1-trichloroethane(1,1,1-TCA) and trichloroethylene(TCE).It is noteworthy that 1,4-dioxane often occurs in symbiosis with 1,1,1-TCA and has a similarity contamination plume distribution to 1,1,1-TCA. The natural attenuation of 1,4-dioxane in groundwater environment is weak, but there is a certain degree of biological oxidation attenuation. Current methods for treating 1,4-dioxane pollution mainly include extraction-treatment technology, advanced oxidation treatment technology, modified biological treatment technology and phytoremediation technology, all of which have their limitations in practical application. Currently, there is no environmental regulation available for the 1,4-dioxane pollution worldwide, and no enforceable standard established for defining the health trigger levels of 1,4-dioxane in drinking water. Research on this contaminant in China is generally limited to the site or laboratory scale, and there are no studies on the environmental risk and quality standards for 1,4-dioxane in the water environment.

关键词： 1 4-dioxane Chlorinated hydrocarbon Environmental pollution Attenuation

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Synthesis of Crystallized BaWO<sub>4</sub>Nanorods in a Microemulsion System

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Advances in Chemical Engineering and Science 2017年第2期7卷 228-234页

作者： Jie Zhang Xiaoshu Zhu Heyong Huang Yinping Zhang Nanjing Normal University Center for Analysis and Testing Nanjing China Biomedical Materials Testing Service Center in Jiangsu Province Nanjing China

BaWO4 nanorods have been successfully synthesized in w/o microemulsion system containing barium ions via a simple reaction between Ba2+ and . The BaWO4 Nanorods were characterized by XRD, TEM, and SEM, respectively. Results showed that the solvents composition—volume ratio of 4-dioxane and distilled water—played the key role in the formation of BaWO4 Nanorods. Furthermore, the strong vibration at 925 cm﹣1 on its Raman spectrum indicated that the BaWO4 nanorods is good at stimulating Raman scattering in transient and steady-state, making it as a promising candidate material for laser with self-raman conversion of radiation inside the active medium.

关键词： BaWO4 Nanorods Microemulsion 4-dioxane Raman Spectrum

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